As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESENT AT 10000 - 8000FT MSL OILY ODOR IN COCKPIT. NO NOTICEABLE ODOR WAS DETECTED AT ANY CABIN LOCATION. THE AIRCRAFT WAS GROUNDED. REPLACED APU ACCESSORY COOLING FAN IAW AMM 49-52-00. APU DUCTS AND INLETS CLEANED. NO FURTHER ODOR NOTED AND AIRCRAFT IS OK FOR SERVICE.